Feeding mechanism for sewing-machines.



A. GRIEB. FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JULY 15. 1914.

1,161,3U'Y. Pateht-ed Nov. 23, 1915.

WITNESSES.

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COLUMBIA PLANoukAPH CD.,WASMINOTDN, D. C.

a l TED AEh PAT T1 ALFRED GRIEIB, 0E ELIZABETH, NEW JERSEY, ASSIGNOR T0 SINGER MANUFAC- TURING- COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHIN ES.

Specification of Letters Patent.

Patented Nov. 23, 1915.

Application filed July 15, 1914-. Serial No. 851,046. r

To ail whom it may concern:

Be it known that I, ALFRED GRIEB, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Feeding Mechanisms for SewingMachines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a feeding mechanism for sewing machines, designed particularly for stitching the linings and sweatbands into hats, in which a single chainstitch looper cooperates with a reciprocating needle to form stitches.

It has for its object the construction of a machine of this character capable of making a long stitch and in which the fee'dand looper-mechanisins are of simple construction and are arranged within the cylindrical work-support or casing of a comparativel y small diameter. This has been accomplished in the preferred form of the improvement by mounting the parts within the end of the cylindrical casing or work-support in such manner that they are easily accessible for adjustment and repair and within easy reach of the operator for oiling. The cylindrical work-support is provided with the usual bearings for the main or driving shaft which carries at its end a feed-lift eccentric and a single-chain-stitch looper, such as is used on the Singer No. 24 ma chine. In the cylindrical work-support there is also journaled the feed rock-shaft parallel with the main-shaftf and receiving rocking movements from an'adjustable eccentric on the main-shaft below the base of the overhanging arm. Mounted on the end of the work-support, directly beneath the needle-bar, is the laterally swinging feedbar or feed-dog carrier, which, at its lower end, is pivotally supported by a feed-lift arm journaled on a. bearing stud rigidly secured to the end of the work-support. Embracing the feed-lift eccentric on the mainshaft is a depending link pivotallv connected to the feed-lift arm actuating the feed-dog carrier. The work-advancing movements are imparted to the feed-dog carrier from a link connection with a crank-arm 011 the forward end of the said rock-shaft.

In the accompanying drawings, Figure 1 is a side view of a sewing machine embodying my feeding mechanism, the cylindrical work-support being shown in section to more clearly expose the parts. Fig. 2 is an end view of the cylindrical work-support on a larger scale, with the feed-dog carrier and mechanism for actuating the same.

As represented in the drawings, the frame of the machine comprises the hollow cylindrical work-support or horn'l upon whose rear endis secured the standard 2 having the overhanging arm 3, terminating in the usual head 4. Journaled in bushed bearings of the hollow work-support 1 is a main-shaft 5 carrying at its forward end a looper 6 and an eccentric 7, the rear end of the shaft being formed with a crank 8 whichis embraced by a pitman 9 connected with the on the overhanging arm 3. The forward end of the needle-lever 10 is connected by means of a link 12 with the needle-bar l3 journaled in the head 4:, and carrying a needle 14 which cooperates with the looper 6 in the formation of stitches. Journaled in the-cylindrical work-support 1 is a rockshaft 15 to which is secured at its rear end a crank-arm 16 carrying a pin 17 connected by an eccentric rod 18 to anadjustable eccentric 19 carried by the main-shaft 5. Secured to the front end of the rock-shaft 15 is an upwardly extending arm 20 connected by a link 21 with the laterally swinging feed-baror feed-dog carrier 22 apertured at its lower'end to embrace a fulcrum-stud 23 sustained by a feed-lift arm 24.. This arm is fulcrumed on-the bearing stud 25-secureol inthe work-support of the machine by the set-screw 26. Embracing the feed-lift eccentric 7 on the forward end of the mainshaft 5 is a depending link 27 whose lower end is pivoted by means of the stud 8 to the arm 24:. Adjustably secured to the upper end of the carrier 22 is the feed-dog 29 held in position by the clamping screw 30, the feed-dog projecting through suitable openings in the curved throat-plate 31 opposite the usual presser-foot 32 carried by the Presser-bar 33 journaled in the head at. The usual cap 34 is applied to the end of the work-support for inclosing the moving parts.

As represented in the drawings the needle bar 13 is adapted to travel in a path slightly inclined to the work-support to facilitate stitching a hat at the junction of the crown and rim. Thefeed-dog carrier 22, with its feed-dog I 29, receives its work-advancing movements crosswise of the cylindrical work-support from its-connection with the rock-shaft 15 through the link 21, the extent of such movements, and'cons'equently length of stitches, depending upon the adjustment of the eccentric 19 upon the shaft 5. The

rising and falling movements are imparted to the feed-dog carrier 22 through the rocking movements of the feed-lift arm 24 upon .relative positions of theparts also prevent what foreign matter, such as lint or particles of straw-braid which accidentally fall through the-feed-dog .openings in the throatplate, from clogging up the parts, the latter -be1ng so arranged. that all foreign matter 'Will immediately fall between the moving parts upon the bottom of the end-cap. It will: be further observed that the center of oscillation of the feed-dog carrier 21 coin- I r cid'es. with the center of curvature of the upper portion of the cylindrical work-support 1, causing the feed-dog 29 to remain in contact with the. work for almost the entire length of its stroke and insuring a positive and uniform advance of the material during the stitching operation. It

will also be observed that the fulcrum-stud 28 of the feed-dog carrier 22 is located considerably below the feed-dog 29, by which arrangement it is possible to so. adjust the feed-eccentric 19 as to permit the making of long stitches without changing materially the angular relation of the feeding device tothe throat-plate, which is desirable when securing linings into hats.

While the present improvement is shown embodied in a sewing machine having a cylindrical work-support or horn, it is evidently as well adapted for machines provided with a flat bed or work-support, the invention being susceptible of considerable modification in construction and arrangement of its parts without departing from its scope.

Having thus set forth the nature of the invention, what I claim herein is 1. In a feeding mechanism for sewing machines, the combination with a driving shaft, a rock-shaft parallel therewith, connections between the two for oscillating the latter, a feed-lift arm journaled upon a fixed fulcrum, a feed-bar pivotally mounted thereon, a crank-arm secured to said rock-shaft, connections between said feed-bar and crankarm for imparting to the former work-advancing movements, an eccentric on the driving shaft, and connections between said eccentric and feed-bar for imparting to the latter rising and falling movements.

2. In a feeding mechanism for sewing machines, the combination with a driving shaft, a rock-shaft parallel therewith, connections between the two for oscillating the latter, a feed-lift arm, a feed-dog carrier pivotally mounted thereon, connections between the rock-shaft and feed-dog carrier for oscillating the latter, an eccentric on the driving shaft and connections between said eccentric and feed-dog carrier for imparting to the latter rising and falling movements.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ALFRED GRIEB.

Witnesses:

HENRY A. KORNEMANN, Jr., WM. P. STEWART.

1 Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

1 Washington, I). C. 

